Btjdolf schtjle



UNITED STATES PATENT OFFICE,

RUDOLF SCHi ILE, OF FRANKFOBT-ON-THE-MAIN, GERMANY, ASSIGNOB, TO CASSELLA. COLOR COMPANY, A CORPQBATiON OF NEW YORK.

DISAZO-DYESTUFFS AND PROCESS OF MAKING THE SAME.

No Drawing.

To all whom it may concern:

Be it known that I, RUDOLF SOHt'IIm, Ph- D., a subject of the Swiss Republic, residing at 45 Guenthersburg Alice, in Frankfort-onthe-Main, Germany, have invented new, Disazo-Dyestufis and Process of Making the Same, of which the following is a full description.

According to this invention disazo dyestuffs are obtained from aminoazo compounds and aminoaryl 8 oxy 1.2 naphthimidazole-sulfonic acids and are further diazotized (on the fiber) and developed with phenylmethylpyrazolone, phenol, cresol or resorcinol. The developed dyeings possess fine green shades and are of good quality as regards fastness to washing, soap and light. The various amins ofthe benzene and naphthalene series and their sulfonic acids are 20 employed as first components and primary amins containing a free p-position and oapable of being coupled particularly aminocresolether, oz-naphthylamin and l-naph- SOsNa blackish green shade turning into a brightbluish green by diazotizing on the fiber and developing with phenylmethylpyrazolone.

Example 2: The diazo compouiid obtained from 23 kilos acetphenylenediaminsulfonic OC H The dyestufi is soluble in water with a- :0 greenish black color, with concentrated sul Specification of Letters Patent.

ita /k, I

Patented Aug. 8, 1916.

Application filed October 8, 1914. Serial No. 865,101. 7

thylamin-fior 7-sulfonic acid are employed asmiddle components. The shades 25 of the dye depend upon the selection of the components but dyeings having yellowish green to bluish green shades may be produced by developing with phenylmethylpyrazolone.

The process is illustrated by the following examples i Example I: 32.7 kilos of the monoazo dyestulf benzenemsulfonic acid azo-anaphthylamin are diazotized with 6.9 kilos of sodium nitrite in 20 kilos of water at 2025 (hand '27 kilos of hydrochloric acid 19? B. The diazo compound thus obtained is then stirred into a solution of 35.5 kilos of m-aminophenyl-S-oxy-L2-naph- 40 thimidazole 6 sulfonic acid containing 25 kilos of sodium carbonate and cooled with ice. After stirring the combination is soon complete and the dyestuif is salted out and filtered off. The dyestuff has the f0llowing structural formula: V

combined with 13.8 kilos aminocresolmethylether in an acetic acid solution. The resulting monoazo dyestuff is further diazotized 0 by means of 6.)) kilos of sodium nitrite and hydrochloric ac" at 15 C..and added to a solution of 4 .5' kilos m-aminophenyl-8- oxy-1.2-naphthimidazole-3.6 disulfonic acid at 0 C. kept alkaline by means of sodium 5 carbonate. Thedyestufl' is salted out by common salt from the warmed solution.

It has the following structural formula 2' 1180 8 SOgNl furic acid it yields a bluish green solution. It dyescotton bluish black-green shades which are changed into a .very clear yellowish green by developing with phenylmethylpy'razolone. By developing with phenol or resorcinol bluish green or yellowish green shades are obtained.

Example '3 By substituting for the aminocresolmethylether in Example 2, 14.3 kilos SOgNQ Example 4; 22.3 kilos a-naphthylamin- 2-sulfonic acid are diazotized by means of 6.9 kilos sodium nitrite and'hydrochloric acid. Thediazo compound thus Obtained is combined in an acetic acid solution with 13.8 kilos of 'aminocresolmeth lether. The and is then further diazotized by means of 6.9 kilos sodium nitrite and hydrochloric acid. The diazoazo compound thus formed is again filtered ofi", stirred with ice water and allowed to flow into a soda alkaline solution containing 35.5 kilos m.-aminophenyl-8-oxysome i oca3 position, rediazotizing the mono'azo dyestufl" thus formed and combining with an amino aryl-8-oxy 1.Q-naphthimidazolesultonic acid substantially as described. 2. As new products the disazo dyestuffs. prepared by combining a diazo compound a-naphthylamin, a very similar dyestufi' obtained; the direct and developed dyeings are however somewhat more bluish green in shade. The solution 1n Water is ofa greenish black color, in concentrated sulfuric acid of l a dark green color. structural formula:

It has the following g 1.2-naphthimidazole- 5 sulfonic acid produced from the diaminoacid dyestuff separated from the warmed solution by means of common-salt.-

It corresponds to the structural formula:

. rin-- cwith a primary aromaticamin containing a free p-position, rediazotizing' the monoazo dyestufi thus formed andcombining with an aminoaryl 8 oxy-1.2-naphthimidazole sulfonicacid, these dyestuffs being in the dry state dark powders, dissolving in Water witha greenish-black color, in concentrated sulfuric acid with a green color v dyeingl cotton blackish-green shades, which are changed on being developed on the fiber with phenylmethylpyrazolone into brilliant green shades, substantially as described.

"In Witness whereof I have hereunto signed my name this 17th day of Sept, 1914, in the presence of two subscribing witnesses.-

DR. RUDOLF SCHULE,

" Witnesses:

J an: GRUND, CARL GRUND.

It is hereby certified that in Letters Patent No. 1193,8229, granted August 8, 1916, upon the application of Rudol f Schiile, of Frar1kfort-omthe-Mein, Germany, for an improvement in Disstzo-Iiyestufis and Processes of Making the Same, errors appear in the printed specification requiring correction as f allows: Page 2,1ine 36, formula, for sO Na read 80 E; seme page, line 59, formula, for SO,H read SO,Na and that the said Letters Potent should be read with these corrections therein that the saine may conform to the record of the case in the Patent Office.

Signedand sealed this 12th day of September, A. 1)., 1916.

[smut] F. W. H. CLAY,

Acting Commissioner of Patents. 

